374 BOTANY OF SOCOTRA. 



4. D. repanda, Fries Lich. Europ. p. 194. 



Parmelia repanda ejusd. loc. cit. p. 177; Divina repanda, Fr. ; Nyl. Lich. Alg. p. 313 pr. p., 

 Prodr. Lich. Gall, and Alger, p. 97 pr. p. (cum D. Ceratoniw, Fries, combiaata). 



A D. Ceratonice, Fries, differt omnibus partibus validioribus, margine tballode crasso, proprio 

 autem multo tenuiore v. subinde subevanescente, bypothecio medio valde triangulari- 

 incrassato et sporis crassiuribus, rectis, utrinque minus distincte acutatis. Species amba? 

 gonidia depauperato-cbroolepoidea offerunt. 



Socotra. Ad saxa calcarea. B.C.S. n. 1323, 1328, 1334 

 Distrib. Mediterranean region. 



2. OPEGRAPHA. 



Opegrapha. Nyl. Ess. 188. 

 Opegrapha, Acb. pr. p. et Auct. pr. p. 

 Opegrapha, Lecanactis, Botula, Auct. 



A wide dispersed genus of all regions ; the richest of the Socotra Lichen - 

 flora. Seven of our ten species are new and endemic. 



1. O. (Lecanactis) chloroconia, Mull. Arg. 



Lecanactis chloroconia, Tuck. Obs. 1864, p. 285. 



Ludens tballo fere nullo et disco (virenti-pruinoso) apotheciorum fere omnino v. pro parte 



omnino nudato. 

 Facile pro Patellaria babenda, sed gonidia concatenata sunt. 



Socotra. Ad ramulos, cortices ramorum et ad truncos decorticatos. 

 B.C.S. ml 1314 pro parte, 1316 pro parte, 1338 pro parte, 1361 pro parte, 

 1456 pro parte. 



Distrib. America. 



2. O. (Lecanactis) vestita, Miill. Arg. in Proc. Roy. Soc. Edin. xi. (1882), 

 466. 



Tballus albus, tenuis, bevigatus, nitidulus, zona fusca cinctus; gonidia circ. 7 mm. lata, 

 concatenata. Apothecia primum orbicularia, dein oblongata, 1-1 £ mm. longa, simplicia v. 

 altero latere uniramea, sessilia, late adnata, primum undique accessorie sat crasse thallino- 

 vestita, marginibus incurvis turgidulis et albo-vestitis, margines proprii lecideini dein 

 emergentes et latius disjuncti imove horizontaliter divergentes et superne demum extus et 

 supra a tballo nudati et nigri; discus semper copiose albido-pruinosus; peritbecium sub 

 bypothecio crassius ; hypothecium flavescenti-pallidum ; epithecium nigricans, lamina 

 byaliua; paraphyses laxe connexo-ramosae. Asci cylindrici, 8-spori. Sporse fusiformes et 

 hyalinte, 20-28 fx longa3, G-7 /m latse, 8-loculares. 



Juxta 0. elegantem, Miill. Arg. locanda est, a qua differt thallo loevigato, apotheciis emersis, extus 

 primum insigniter thallino-vestitis, et distincte majoribus. Eeliqua utriusque satis 

 congrouunt. 



Socotra. Ad ligna decorticata. B.C.S. n. 1317 pro parte. 

 Distkib. Endemic. 



